Chemistry Additional- New materials and polymers

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Created by: Harriet
Created on: 05-12-14 17:54

Give an example of a 'smart' material

nitinol

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How does nitinol behave?

It is a shape memory alloy and behaves differently depending on it's temperature

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What are nanoparticles?

really small particles- between 1-100nanometres

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What are two different applications of nanoparticles?

to form nanotubes and tennis rackets

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What are thermosetting polymers?

They have crosslinks which hold together the chains in a solid structure. This means that they don't soften when heated and are strong, hard and rigid.

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What are thermosoftening polymers?

They don't have crosslinks do the forces between the chains are easy to overcome. This means that it is easy to the melt the plastic and when it cools it hardens into a new shape. They can be remoulded over and over again.

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What affects the properties of a polymer?

The starting materials and reaction conditions

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What is the difference between how low density polythene and high density polythene are made?

LD polythene is made by heating ethene to about 200 degrees centigrade under high pressure. This makes it flexible. HD polythene is made at a lower temperature and pressure (using a catalyst) which makes it more rigid.

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Why could nanoparticles help make new industrial catalysts?

They have a huge surface are to volume ratio

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Why can nanoparticles be used for different things compared to their 'bulk' chemical?

They have very different properties

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